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Applied Physics 2022
一种基于半圆形开口谐振环结构的太赫兹环偶极子超表面设计
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Abstract:
设计了一种基于半圆形开口谐振环结构太赫兹环偶极子谐振的超表面，超表面的单元结构由金属结构层及基底介质组成。金属结构层由一对对称半圆形开口谐振环和一个矩形金属条构成。利用电磁仿真软件研究了半圆形半径r及开口距离d对超表面谐振频率、品质因子Q值等电磁特性的影响；通过计算超材料多极子的散射功率研究内部机理。发现超表面的谐振响应随着半径和开口间距的改变而发生变化；该设计实现了一种新型太赫兹波段的平面环偶极子超表面，为太赫兹功能器件的开发和应用提供了更多的可能性。
A metasurface based on Terahertz (THz) toroidal dipole resonance of split semi-ring resonator structure is designed. The unit structure of metasurface consists of a pair of symmetric semicircular split ring, a metal strip and a substrate medium. The influence of the change of semicircular radius (r) and opening distance (d) on the electromagnetic characteristics of metasurfaces such as resonance frequency and quality factor (Q) was investigated by using the electromagnetic simulation software. It is found that the resonant response of the metasurface varies with the radius (r) and the spacing gap between split semiring. The design implements a new terahertz band planar toroidal dipole metasurface, which provides more possibilities for the development and application of terahertz functional devices.
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